The fact is there is only a handful of places where this technology exists.
The one I am familiar with is the reserch dept. run by Dr. Magnus Hasselqvist of the company Siemens in the Swedish town of Finspong.
Of course GE, Siemens and RR are competitors so unless GE and
PR will buy the patent and know how from Siemens this will get no where.
You can weld what you want to the alloys Magnus formulates...he is the leader in this field. The formal address is Siemens Industrial Turbomachinery AB in Finspong Sweden and the boss is called Vladimir Navrotsky.
Good outfit.